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Thousands of police have clashed with protesters for control of downtown Cairo's Tahrir Square, leaving at least 81 people injured and four arrested.
The violence on Saturday comes just nine days before Egypt's first elections since the ouster of Hosni Mubarak, the former president, in February.
In scenes reminiscent of the 18-day uprising, protesters and police forces hurled rocks at each other, and crowds swarmed an armored police truck, rocking it and setting it ablaze.
Witnesses said the violence began when riot police dismantled a small tent camp set up to commemorate protesters killed in the earlier revolt and attacked around 200 peaceful demonstrators who had camped out in the square overnight.
Tens of thousands of people had gathered in Tahrir Square on Friday to denounce Egypt's ruling military council, which has been criticized for its oversight of Egypt's transition period. Protesters are angry with alleged attempts by the military to grant themselves special powers over the next elected government.
At least one person has been killed and more than 600 wounded in fierce clashes between protesters and security forces in central Cairo.